抄録
Laboratory-scale moving granular bed filter was built in order to study the collection mechanisms of the moving bed. The distributions of granule moving velocity and packing density in the bed were measured with and without dust loading, and the distributions of collected dust in the bed were determined by sampling the granules directly from the bed. It was found that the use of louver facilitates the replacement of granules at the entrance region of the bed so as to achieve stable operation and that an increase in filtration velocity leads to a decrease in packing density because of the larger cavities formed in the bed. Further, the measurements of collected dust distributions in the bed revealed that the collection of dust particles occurs in a narrow entrance region of the bed and that the maximum dust retention on the granules depend on the granule moving velocity and the filtration velocity. Below the maximum dust retention, the amount of dust particles retained by the granules is found to be a function of total incoming particle load during the time period for which the granules are exposed to the aerosol stream.
